Improvement in fruit-jars



J. C. BAKER.

Fruit Jar.

No. 29,557. Patented Aug. 14. 1860.

Witnesses= Q7 @5204 fix/gy AM. PHOTO-LITHO.CU.N.V. (OSBDRNE'S PROCESS.)

UNITED STATES PATENT OFFICE JOHN C. BAKER, OF MEOHANICSBURG, OHIO.

IMPROVEMENT lN FRUIT-JARS.

Specification forming part of Letters Patent No. 29,557, dated August 14, 1860.

I0 aZZ rah mt it may concern.-

Be it known that I, J. G. BAKER, of Mechanisburg, in the county of Ohampaign and State of Ohio, have invented new and useful Improvements in Fruit-Jars; and I dohereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming a part of this specification.

Like letters designate corresponding parts in different figures of the drawings.

Figure 1 represents a perspective view of my' improved jar. Fig. 2 represents a sectional view lengthwise of the clamp or yoke, showing the general construction of the cap plate, of which my invention consists.

To enable those skilled in the art to manufacture my improved jar, I will proccedto described the construction of the same.

A is the jar, with the peculiar con'ical capplate or cover 0. B B are inclines formed on and withthe jar, making two sections or parts of screwthreadsin which the clamp D works when the operator wishes to seal the jar. The ends of the clamp or yoke D are so bent that they pass over, down, and under the inclines B B, thereby forming a complete screw. Between the cap-plate or cover 0 and jar A is a thin india-rubber gasket, a, passing around the entire circumference of the-cover, and is attached to said cap-plate on the interior under side, and is in contact with the jar when said cap-plate is pressed down by the clamp or yoke D. This peculiarlyconstructed capplate is of a conical form, with a small depression in the apex to allow the small pivot e on the clamp D to work in. This cap is made in this particular conical shape for the purpose of resisting to a great degree the pressure coming from the clamp or yoke D when it is screwed up. The cap-plate is made by machinery, and is necessarily rendered very cheap. It is formed of any metallic substance that will not yield to the pressure. The incline B commences at the space E. This space E is for the purpose of removing the clamp or yoke when it is unscrewed, allowing the cap-plate to be removed at pleasure.

What I claim as my invention, and desire to secure by Letters Patent, is-

The peculiar conical form of the cap C,with a depression in the apex for the pivot c, and a groove around the base for the gasket a, when employed in combination with the clamp D and inclines B B, as and for the purpose set forth.

JOHN C. BAKER.

\Vitnesses:

D. RAUDEBAUGH, JOHN T. llIORGAN. 

